Opera 10.60 has been released July 1 for Mac OS X and is available for download. The features highlighted on the changelogs page are: layout engine (codename 'Presto'), HTML5 with support for offline web applications, WebM, which has been available in Opera (in a special build) on the very day of the announcement at the Google I/O conference, web workers for running scripts in the background without impeding the browsing experience, and geolocation. Version 10.60 is also available for Windows and Linux/BSD.

It actually supports GTK+ now as well, which is a good move by the Opera team.

I like the UI, it looks slick but the menus look like some X fall-back, not GTK+.

I'm glad the Opera team cleared their download mess up as well and now detects x86/x86_86 when you download Opera. The whole Qt3/x86 by default and Qt4, x86/x86_64 kept hidden was messy. The main thing is, it's an improvement for the Linux version anyway.